PSY 101 Lecture Notes - Lecture 4: Heritability
Document Summary
Twin studies: study of the relative effects of heredity and environment on behavior and mental processes, monozygotic twins share 100% of their genes, dizygotic twins share 50% of their, 46 chromosomes in total, 26 from genes each parent o. If you inherit a dominant gene from one parent, then that trait will be expressed: recessive genes o recessive genes for a trait are only expressed if you inherit two of them (one from each parent, polygenetic traits, and, often, the twins are raised in the same environment. If a specific trait is inherited, relatives should show increased trait similarity compared to unrelated people: closer relatives, like siblings, should show more similarity than distant relatives o traits that are controlled by. Studying inheritance in humans: heritability o a statistical formula that provides a percentages of variation in a pop. attributable to genetic factors rather than to differences in the environment.
